Air-compressing pump



\ A.-D. PERKINS.

AIR COMPRESSING PUMP. APPLICATION-FILED MAY 19, 1911.

1,370,993, Patented Mar. 8, 1921.

V al gmQex. ns

21 ATTORNEY length than other PATENT OFFICE.

ALONSON D. PERKINS, OF NEW YORK, N.'Y.

AIR-COMPRESSING PUMP.

Specification of Letters Patent.

Patented Mar. 8, 1921.

Application filed May 19, 1917. Serial No. 169,651.

To all whom it may concern:

Be it known that I, ALoNsoN D. PERKINS, a citizen of the United States, and a resident of New York, county and State of New York, have invented a certain new and useful Improvement in Air Compressing Pumps, of which the following is a full, clear, and exact specification.

This invention relates to a class of de vices for generating air under pressure.

My invention has for its object primarily to provide an air compressing .pump designed to be employed for. inflating the pneumatic tires of motor driven vehicles as well as being available for supplying air under pressure for other purposes, and which is adapted to be operated by the foot of a person. The invention consists mainly of a frame, a cylinder with a pistonreciprocable therein, and mechanism which is operable by the foot of a person to reciprocate the piston for generating a supply of compressed air. The cylinder and the mechanism are operatively mounted on the frame in spaced relation so that the cylinder and mechanism will be on approximately longitudinal alinement when operated to drive the piston home in the cylinder, thereby permitting of a piston stroke of considerably greater types of pumps of this class.

Other objects of the invention are to provide on the mechanism a foot pedal which is movable in the radius of a circle to allow the mechanism to be operated when the leg of the operator may be moving at various angles; to provide a catch whereby the cylinder and operative mechanism may be releasably held in collapsed positions; and to provide an air pump adapted to be made to combine reat efficiency and durability.

With these and other objects in view, the invention will be hereinafter more particularly described with reference to the accompanying drawing forming a part of this specification in which similar characters of reference indicate corresponding parts in all the views, and will then be pointed out in the claims at the end of the description.

In the drawing, Figure 1 is a perspective view of one form of air pump embodying my invention.

Fig. 2 is a detail sectional view taken on the line II-II of Fig. 1 on a plane per 'pendicularto the base of the pump.

Fig. 3 is a top plan of the pump as viewed from one of its ends with part of the flexible delivery tube removed therefrom.

Fig. 4 is a perspective view looking at the pump from its second end.

Fig. 5 is an enlarged fragmentary sectional view, partly in detail, taken through the piston used in the apparatus, and

Fig. 6 is a top plan, partly broken away, of the piston.

The apparatus, or air pump has a frame 10 composed of a base plate 11 preferably of substantially a rectangular shape, and projecting upwardly from one end of the base plate-are two spaced eyes, or apertured lugs 12 and 13. Extending upwardly from the second end of the base plate are also two spaced eyes, or orificed lugs 14 and 15.

Mounted on. the frame 10 so as to be swung upwardly and downwardly is. a pump, as 16,

having a cylinder 17, and on one end of this cylinder is a fixed cap 18 from which two apertured lugs 19 and 20 extend; The lugs 19 and 20 are spaced apart so as to movably interfit between the lugs 12 and 13 of the base plate of the frame, and in the apertures of these lugs as well as in the apertures of the lugs 12 and 13 is a rod 21 for pivoting one end of the cylinder of'the pump to the frame 10 so that the other end ofthe cylinder may be swung in upward and downward directions. The other end of the cylinder 17 may be exteriorly threaded, and on this threaded end is removably screwed an. interiorly threaded cap, as 22, with an opening 23 therethrough. Also through the cap 22 is an intake 2% for admitting air into the interior of the cylinder, while the upper part of the cap 18 of the cylinder may be enlarged, as at-25, and through this enlarged part is an outlet 26 leading from the interior of the cylinder through the top of this cap for distribution of compressed air when generated by the pump. The outlet 26 may lead into a nipple, as 27, to permit a flexible tube,

as 28, to be fastened to the pump for conveying the compressed air delivered through the outlet to a receiver for the air, for example, the pneumatic tire of a motor driven vehicle. Reciprocable in the cylinder 17 of the pump is a piston 29 provided on one end of a rod 30 which is of a length so that its other end movably extends through the opening 23 of the cap 22 as well as extending some distance beyond the cylinder.

The piston 29 of this pump may be of any desired type, though I prefer to employ the form of piston illustrated which is composed of a disk 31 having on its edge a depending annular flange 32 which is bent angularly to provide in its outer surface a concentric groove, as 33. This grooved disk is arranged on the free end of the piston rod, and also on the rod above the disk is another disk 34. Both of the disks 31 and34 are slightly less in diameters than the interior of the cylinder of the pump, and on the piston rod between these disks'is a washer 35 of an inverted concave shape to provide a downwardly turned annular flange 36 which is outwardly flared. This washer may be made of leather, or rub her, or other suitable yielding material, and its flared flange may be of a greater diameter than the disks. In the concentric groove 33 of the disk 31, is mounted a coil spring, as 37, arranged between the disk and the flange of the washer, and this spring is of a length to approximately encircle the flange of the disk so as to serve for yieldingly forcing the flange of the washer in close movable contact with the wall of the cylinder of the pump, in order to eflt'ectually draw air into the cylinder as well as to force the air therefrom when the piston is reciprocated.

To operate the pump 16 for generating a supply of compressed air, mechanism, as 38, of a form adapted to be operated by the foot of. a person is provided. This operating mechanism has a lever 39 which may be composed of two bars 40 and 41 disposed in spaced parallel arrangement, and one end of these bars is pivoted by means of a rod 42 rotatable in the orifices of the lugs 14 and 15 of the base plate of the frame 10 so. that the other ends of the bars may be swung back and forth toward and from the pump. The space between the bars 40 and 41 of the lever may be slightly greater than the width of the cylinder of the pump, and these bars as well as the cylinder are of rela tive lengths so that when the apparatus is operated, as will be hereinafter more fully explained, for forcing the piston of the pump home in the cylinder the pump and the lever will be on approximately longitudinal alinement by the free end part of the cylinder being admitted between the free end parts of the bars of the lever. Between the upper part of the bars 40 and 41 of the lever 39 is a cross-plate 43 having two downwardly projecting spaced lugs with a transverse rod 43 therebetween, and on this rod is rotatably held the second end of the rod 30 of the piston of the pump so that the pis ton will be reciprocated in the cylinder of the pump when the lever 39 is swung toward and from the pump. On the rod 42 which pivots the lever 39 to the lugs 14 and 15 of a the frame 10 is wrapped a spring 44 formed so that two of its ends abut on the base plate 11 of the frame, while from the central part of the spring is an arm, or loop, as 45, projec'ting upwardly between the bars 40 and 41 of the lever 39. The upper end of this loop is guided under a cross-rod 46 arranged between the central parts of the bars of the lever for tensioning the spring so as to normally force the lever in an upward direction from the frame 10 as well as in a direction to guide the piston of'the pump outwardly of the cylinder.

In order to permit the mechanism 38- to be operated by the foot of a person, a pedal, as 47, is provided. The pedal 47 is prefer,- ably in the form of a substantially rectangular plate 48 having on the central parts of its side edges downwardly dis osed eyes, or apertured lugs 49 and 50. hese eyes are spaced apart at a distance so that the free ends of the bars of the lever are movably disposed therebetween, and both lugs are pivoted, at 51 and 52, to the bars of the lever to allow the pedal to be swung over the upper end of the lever in the radius of a circle. By arranging the pump and the mechanism 38 in this manner the apparatus may be operated with the leg of a person positioned at various angles, while the foot of the operator is placed on the pedal 47. With the downward pressure of the leg and the foot the pedal and lever 39 will be swung also downwardly as well as toward the pump against the tension of the spring 44, and the piston of the pump will be forced inwardly of the cylinder which in turn will be swung upwardly from the base plate of-the frame 10. The piston will thereby be driven its maximum stroke home in the cylinder, and when the pressure of the foot on the pedal is released the tension of the spring 44 will cause the lever 39 to be reversely swung to carry the piston the full length of the cylinder to its opposite end;

An air compressing pump of great efiiciency is thus provided, and to releasably hold the cylinder with its piston together with the operative mechanism 38 in collapsed positions so that the pump when not in use may be packed into a limited space, I provide a catch, as 53. The catch 53 may be in the form of a hook which is pivoted, at 54, to a lug 56 provided on the base plate of the frame 10 so as to detachably engage the rod 46 between the bars 40 and 41"of the lever 39 when the leverand thepump proper are guided accordingly toward the base plate of the frame 10. V

In the foregoing description, I have embodied the preferred form of invention, but I do not wish to be understood as limiting myself thereto, as I am aware that modifi ca' tions may be made therein without departing from the principle, or sacrificing any of the advantages of this invention, therefore I reserve to myself the rightto make such thereof.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. In a device of the character described, in combination, a base, a cylinder mounted thereon, a piston reciprocable in said cylinder, an integral sheet member pivotally mounted on the base, said member having side walls and abridge piece connecting the walls and dependingiears cut out of and depending from said bridge piece, a pivot pin carried by said ears, and means connecting said piston to said pivot pin whereby the piston is reciprocated upon movement of said member.

2. In a device of the character described, in combination, a base, a cylinder mounted thereon, a piston reciprocable in said cylinder, an integral sheet metal member pivotally mounted on the base, said member having side walls and a bridge piece connecting the walls intermediate the ends thereof, a pedal having depending ears extending over and pivoted to the free ends of the walls, whereby the walls are held against distortion, and means for reciprocating said piston upon movement of said member.

3. In a device of the character described, in combination, a base, a cylinder mounted thereon, a piston reciprocable in said cylinder, ears extending upwardly from said base, an integral sheet metal member having side walls extending over and pivoted to said ears'at one end and a bridge piece connecting said walls intermediate the ends thereof, a pedal having depending ears over and pivoted to the free ends of the walls whereby the walls are held against distortionand means for reciprocating said piston upon movement of said member.

This specification signed and witnessed this 18th day of May A. D. 1917.

ALoNsoN D. PERKINS.

Witnesses:

GEORGE F. BENTLEY, V. M. RUMPH. 

